The Laser Heterodyne System is a complete, easy-to-use system for calibrating
and characterizing laser frequency standards. The system characterizes
both short- and long-term behaviors of primary (e. g. iodine-stabilized)
and secondary (e. g. 2-mode polarization-stabilized or Zeeman-stabilized)
laser frequency standards using the highly accurate and sensitive optical
heterodyne technique. A basic heterodyne system accommodates a reference
laser and one laser-under-test, but can be easily expanded to accommodate
multiple lasers or re-configured to meet the needs of special applications.